Pregnancy tests analyze levels of human chorionic gonadotropin,
or hCG, which is a hormone that’s released by a developing
placenta. "A form of it is also secreted by some cancer
tumors, including those of testicular cancer," writes
CTVNews.

Other commentators promptly provided links and information along
with urges that he get tested.

The woman's friend went to an oncologist to be tested and the
doctor found a small tumor on his right testicle. The woman
subsequently posted another
comic to thank Reddit.